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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '597f3bfd5d3b2d563d106f464103c797a255d8a6807b3a243dc92e9bd4b37d2c' 
  AND token = 'vb1WKmBI9wbQyvAeB+Op9t0ehJ5pOEIdbdxWK6zhU2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00196

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}